Ventilator.



Patented Dec. 23, 1902-. s. H. .mcossou.

V E N T l L A TO B.

(Application filed June 20, 1902.)

(No Model.)

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ATENT OFFICE.

SAMUEL HOUSTON J AOOBSON, OF NEW YORK, N. Y., ASSIGNOR TO NATIONAL VENTILATING COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

SPECIFICATION forming part Of Letters Patent NO. 716,714, dated December 23, 1902.

Application filed June 20, 1902. Serial No. 112,557- (lio model.)

To all whom it may concern.-

Be it known that l, SAMUEL HOUSTON JACOBSON, a citizen of the United States, residing at New York, State of New York, have invented a new and useful Improvement in Ventilators, of which the following in a specification. .7

This invention relates to ventilators, more especially to the class that admits air free from to dust, smoke, and cinders. This form of ventilator receives air coming from a direction opposite to the direction of the point of impact of the aircurrent or the air that strikes the device when in motion, and is especially I5 intended to introduce and exhaust a larger quantity of air through a certain aperture than other devices projecting an equal distance from such aperture, as will more fully appear from the subjoined description and claims and the accompanying drawings, in

which- Figure 1 is a view in perspective of the ventilator, and Fig. 2 is a view in horizontal section. v

In the drawings, Adesignates a hood, line,

or casing.

13 is the face of the hood or casing.

O is a base or support or back rest to which the hood is attached.

D is an aperture in the base or support.

E is a two-winged valve inside of the hood oscillating around a pivot F. The ends of the valve are supplied with tips G of some flexible material-such as felt, leather, or india-rubber.

H designates pads or cushions of similar material, against which the ends of the valve strike.

The hood or flue A is rectangular in crosssection, its face, top, and bottom being planes. It may be mounted directly on a sash-rail of a window, in which case the sash-rail itself forms the base or back rest 0. The flue or hood A is prolonged, so as to project a short distance beyond the ends of the aperture D. This aperture is rectangular, the proportion between the height and width being varied according to the shape of the support.

The valve E consists of two rectangular plates united so as to form an obtuse angle atthe point of juncture, or in place of two plates a single plate may be bent in the middle, so that the two halves rest in planes intersecting each other and forming an obtuse angle facing the aperture. The valve E may 5 5 be constructed of smooth or corrugated plate, as may be desired, the latter form having the advantage of presenting a greater area of resistance to the impact of the air. The obtuse angle facing the aperture is so selected that when the one end of a plate or wing of the valve rests against the base the other plate or wing will assume a position substantially parallel with the face of the hood or flue.

The point F is located at a point midway between the two ends of the hood or flue and at a nearer distance to its face than to its base. I have found that when the distance of the pivot from the face of the hood or flue is one-fourth the distance between the face and the base of the hood or flue very good results are obtained.

The tips G and pads or cushions H are supplied to prevent noise that otherwise would 7 5 result fromthe valve striking the base. It is evident that either the tips G or the pads H, or both, might be dispensed with without defeating the purpose of the invention.

The operation of this device is as follows: When a current of air strikes either wing of the valve E, or when the device is being moved through space, as on a car or other vehicle in motion, that wing or plate of the valve E which receives the impact will close against the base, preventing ingress of air and extraneous matter in the air from the aperture at that end of the hood or flue. The wing or plate of the valve resting against the base will then act as a deflector or reflector of the air striking the valve, and a current of air passes between the face of the hood or flue and the other plate of the valve, which will then occupy a position substantially parallel with the face of the hood or flue. This 5 current will produce a counter-current of air passing into the aperture at the end not closed by the valve.

The configuration of the face of the hood or flue, as here shown in connection with the too position of parallelism between one of the plates or wings of the valve E with the face of the hood or flue, has the advantage of presenting a much larger orifice for the entrance of air, and as a consequence there will result a very large increase in the quantity of air admitted and exhausted over what would be obtained by the use of any other form of ven tilator projecting the same distance from the base or support.

What I claim is A ventilator consisting of a hood covering an aperture and attached to a base, the face of the hood being on a plane parallel with the base, and a valve pivoted at a point between 

